caa a22 4500 445300574 CHVBK 20180317142556.0 cr unu---uuuuu 170323e20100401xx s 000 0 eng 10.1007/s11430-010-0008-0 doi (NATIONALLICENCE)springer-10.1007/s11430-010-0008-0 Redevelopment of liftoff rates of saltating sand grains based on a simple optimization model [Elektronische Daten] [Hong Cheng, XueYong Zou] This paper is a redevelopment result of liftoff rates of saltating sand grains based on our previous work. Aeolian sand flow is a complex multi-phase flow because of a special two-phase gas-solid flow near ground surface. Despite extensive research on the movement of blowing sand, no model fully characterizes aeolian sand flow, and large differences often exist between simulations of aeolian sand movement and field observations. One key problem is a few of sufficient research on liftoff rates of saltating sand grains (also called the number of liftoff sand grains per unit time and per unit bed area). It is necessary to research in advance liftoff rates of saltating sand grains. We redeveloped liftoff rates of saltating sand grains by establishing an optimization model based on the flux of aeolian sand flow at different heights of the sampler in wind tunnel and the simulated capture of saltating sand grains by different heights of the sampler that are from different liftoff position (distance from the sampler) in order to revise previous inversion condition of liftoff rates of saltating sand grains. Liftoff rates increased rapidly with increasing wind speed. For frictional wind velocities of u * = 0.67, 0.77, 0.82, 0.83, and 0.87 m s−1, liftoff rates were 3840, 954502, 5235114, 5499407, and 7696291 sand grain s−1 m−2, respectively. These rates could be expressed as the square of the instantaneous frictional wind velocity and a constant (0.663) that differs from the critical (threshold) frictional wind velocity at which saltation begins. Although our results require additional experimental validation and the simple optimization model must be improved, they nonetheless provide a strong basis for future research. Science China Press and Springer-Verlag Berlin Heidelberg, 2010 liftoff rates of saltating sand grains nationallicence optimization model nationallicence wind tunnel nationallicence two-phase gas-solid flow nationallicence Cheng Hong State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, 100875, Beijing, China aut Zou XueYong State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, 100875, Beijing, China aut Science China Earth Sciences SP Science China Press 53/4(2010-04-01), 568-574 1674-7313 53:4<568 2010 53 11430 https://doi.org/10.1007/s11430-010-0008-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11430-010-0008-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cheng Hong State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, 100875, Beijing, China aut NATIONALLICENCE 700 1- Zou XueYong State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, 100875, Beijing, China aut NATIONALLICENCE 773 0- Science China Earth Sciences SP Science China Press 53/4(2010-04-01), 568-574 1674-7313 53:4<568 2010 53 11430 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer